Ikrimah (may Allah have mercy on him) reports that Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: A man of the tribe of Banu Sulaym passed by a group of the Companions of the Messenger of Allah (peace and blessings be upon him) with a flock of goats he had with him. He greeted them with peace, and some of the people said: "This man greeted you with peace only to keep himself safe from you." So they went after him, killed the man and took his goats, then brought that property to the Messenger of Allah (peace and blessings be upon him). At this this verse was revealed: "O you who believe! When you go out in the way of Allah for jihad, investigate well, and do not say to one who greets you with peace, 'You are not a believer.' Do you seek the goods of the life of this world? With Allah there are abundant spoils." To the end of the verse.